MSR has changed the format of their 4 ounce (113g) gas canisters

In addition, the new four ounce class canister is lighter for the amount of gas it contains. The old canisters weighed 8.6oz/244g. The new canisters weigh 7.4oz/211g — for basically the same amount of gas.

Lighter, better packability and a cool new feature: a fuel gauge, that will help determine how much gas is left in the canister – you throw it into water and see how much of it submerges.